Journal of Economic Entomology (1994) 87, 1224-1229

H.L. McBrien, G.J.R. Judd and J.H. Borden (1994)
Campylomma verbasci (Heteroptera: Miridae): Pheromone-Based seasonal flight patterns and prediction of nymphal densities in apple orchards
Journal of Economic Entomology 87 (5), 1224-1229
Abstract: Weekly catches of adult male Campylomma verbasci (Meyer) in sex pheromone-baited wing traps provided a seasonal record of flight activity during 1991 in apple orchards and patches of mullein in the interior of British Columbia. The first of two periods of flight activity reflected migration from apple to mullein, and the second probably represented two generations on mullein followed by migration back to apple. Monitoring of adult male C. verbasci using sex pheromone-baited traps in fall of 1990 and 1991 followed by limb-tap samples for first-generation nymphs the following years showed a significant positive relationship between fall catches and density of nymphs in conventional apple orchards. This result suggests that a pheromone-based monitoring system during fall could be developed to predict the density of nymphs the following spring. There was no such relationship in organic orchards, where adult populations in the fall were similar to those in conventional orchards, but mean counts of nymphs in the spring were 20 times lower. Two probable hypotheses could account for this disparity. Either female C. verbasci lay fewer overwintering eggs in organic orchards or mortality is higher, possibly resulting from biological-control agents acting in some organic orchards.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): John H. Borden

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Campylomma verbasci	Apple (Malus)	Canada (west)